Door-check.



J. KOC n. DooRGv PPPPP OATION FILED 11111.13, 1912. 1,037,641, PatentedSept. 3, 1912.

' 2 SHEETS-SHEET l.A

Zac-@@5115 @Mi-MAQ @m JoHNxocH, JRS, or BRooKLINE, MASSACHUSETTS.

'DOOR-CHECK.

Specification of Letters Patent.

' Patented sept. 3, 1912.

Application led January 13, 1912.. Serial No. 671,047.

To all 'whom t may concern:

Be it known that I, JOHN KOCH, Jr., a citizen of the United States,residing at Brookline, in the county of Norfolk and State ofMassachusetts, have invented new and' useful Improvements inDoor-Checks, of which the following is a specification.

This invention relates to door checks of a simple and inexpensiveconstruction designed primarily for use on all types of fly screen doorsand inside ysolid wood doors.

The annoyance caused by the repeated slamming of doors is a matter ofcommon knowledge, and it is the purpose ofk my invention to provide at amoderate costl a check which will at all times be positive in itsoperation.

The device consists of the combination of a bracket, a pin hung looselytherein and thus permitted a limited lateralmovement as well as freerevolution to an unrestricted degree, a rubber ball or other resilientbody suspended by axial penetration from the lower end of said pin andfree to revolve thereon, and a lat spring so disposed as to restrict thelateral movement of the pin in the direction of the bracket and cause`the pin to re-bound on impact with the spring.

Generally it will be found preferable to attachy the-device to the frameof the door, but ,when desired, it may be attached to the door, or toone of a pair of double doors.

When attached to the door frame, I find it advisable to secure a guardto the edge of the door in such a position that'the ball is preventedfrom' swinging in behind the door as the latter closes. While notessential to the successful operation of my device, this guardeliminates all possibility that the door when suddenly opened will catch4the ball or suspending pin and tear the device from its frame or weakenits fastenings. When the device is attached to one of a pair of doubledoors the guard will beA fastened to the other of the pair.

In the accompanying drawing illust-rating my invention, Figure l isafront elevation of the upper portion of a door frame showing my newdevice attached thereto and the `door partially open. Fig. 2 is a fronteleva tion of a portlon of a closed door and door frame showing mydevice attached to the latter. Fig. 3 is a plan View7 of my deviceattached to the door frame showing the door and door frame in section.Fig. 4 is a side elevation of my device attached to the door frame, asviewed from the left of Fig. 3. Fig. 5 is a plan view of my deviceattached to the door showing the door anddoor frame in section. Fig. 61s a front elevation ofthe upper portion ofa pair of double doorsshowing my device attached to one of the- Same.

Similar letters of reference indicate corr., 4responding parts in theseveral figures of the drawing.

In the drawing, A represents the/bracket, B the pin, C the ball, and Dthe flat spring.

E is the. door andlF the door frame. G is the guard.

X is the helical spring whichvoperates to close the door.

-Y Y are'` the screws which secure the bracket A to the door or doorframe, as the case may be.`

In Fig. 1 the device is shown attached to the frame F ofthe door E byfastening the bracket A thereto by means of the screws Y Y in such aposition that the periphery of the ball Cl projects about one-half of.an inch into t-he pathway of the door.

The method of operation is as follows: As the door E,actuated by theforce of the helical spring X, swings shut, its progress is checked bycontact with the ball C. The force of this impact drives the pin Bagainst the face of the flat spring D, thus bringing this spring intoaction. The combined resiliency of the ball C and spring D causes,

the door ,to re-bound and the ball C to resume its normal position inthe pathway of .the door. Thev continued pressure of the helical springX gradually overcomes vthe momentum imparted by the shock of the reboundand once more throws the door against the ballC, but with less forcethan before. Again the joint resiliency of the ball C and flat spring Dcauses the door to re-bound, but this time `with lessened force andconsequently to a diminished distance. This operation is repeated untilthe door is nearly closed. At each successive repetition, the force ofthe impact and, consequently, the length of the re-bound are diminisheduntilthe former has become so slight that no re-vbound results and butlittle resistance.

is 'offered by the ball C to the insistent pressure of the helicalspring X. Actuated by this pressure, thedoor now gradually pushes the ball C aside and quietly closes. This step in the operation 1s renderedpossible by the lateral play allowed the pin B in the slightly ajar bycurrents of air.

bracket A, and facilitated by the rotation of the ball C on the pin B,and of the pin B to the employment of a yielding feature in the part D,but claim that any stop or detent constructed and located substantiallylike the part D, whether the same be flexible or rigid, is within thescope of my invention.

All prior devices of Athis type have been fatally defect-ive in thatthey lacked certainty of operation. This failure to operateon occasionsgenerally assumed one of two forms. At times, the resistance offered bythe ball or block, in the position in which it lay, would proveinsuiiicient, and the door would rapidly drive it aside and close with aslam. At' others, when for any reason the impact was slight, the ballwould not be driven or pushed out of the way, but would be huggedbetween the door and the casing, and the door thus preventedfromclosing. This last was particularly apt to occur when the door wasbut partially opened or thrown Both of these dilicultiesr have beenobviated and eliminated in the use of my device, which is positive andnever-failing in its operation under all conditions.

I-Iaving thus described my invention and the operation thereof, what Iclaim as new, and desire to secure by Letters Patent is 1. In a doorcheck, the 'combination of a bracket, a pin rotatably supported and freeto swing therein, a stop secured to said pin,

. and a detent adapted to limit the lateral movement of said pin.

2. In a door check the combination of a support, a stop, means forsuspending the stop from said support, and a spring :formedindependently of said means'for suspendin the stop and adapted to limitthe latera movement thereof.

3. In a door check the combination of a supporting member, a pin hungtherein, a

stop suspended upon said pin, and a sprlng formed independently of saidpin and adapted to limit lateral movements ofl said pin.

4. In a door check the combination of a supporting member, a pin restingloosely therein, a resilient body suspended upon said pin, and a springresting in contact with said pin and adapted to r'es'trict its lateralmovement. v l

5. In a door check, the combinatlon of a bracket, a pin'loosely suported therein and free to revolve and, swing aterally therein, a

stop secured to said pin and free'to revolve axially on said pin and aspring adapted to limit the lateral movement of said stop.

6. In a door check, the combination of a bracket, a pin looselysupported therein and free to revolve and swing laterally therein, astop secured to said pin and free to revolve axially on said-pin and adetent adapted to limit the lateral movement of said 1n.`

7. In a door vcheck the combinatlon of a bracket, a pin looselysupported therein and free to revolve and swing laterally therein, a

stop secured to said pin and free to revolve axially on said pin, andasprin formed independently of said pin and a apted to limit the lateralmovement of said stop.

8. In a door check the combination of a bracket secured to the doorcasing, a pin hung loosely therein, a stop suspended on said pin andfree to revolve axially, and a flat spring attached to the. under sideof said bracket and normally resting incontact with said pin and adaptedto restrict the lateral movement -of said pin and to prevent contact ofsaid stop with the door casing.

9. In a door check the combination of a stop, means for suspending thestop, a. sprlng formed independently of said means for suspendin'v thestop and adaptedto limit 'its mot-ion, an a guard attached to the doorand adapted to limit lateral movement of the stop.

